The ever-worsening kidney shortage has inspired some bold concepts of late, such as organ trading and even selling. Now comes some good old-fashioned sharing -- or, maybe, exactly the opposite. LifeSharers, a budding network of more than 12,600 people across the country, including 70 or so in Houston, was founded on a single, seemingly simple premise: that people who agree to donate their organs after death should receive priority if they ever need one. Members get first the first crac